モード拡張法を組み込んだ補強リブ構造変更シミュレーション(機械力学,計測,自動制御)

概要

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This paper proposes a procedure for predicting the modal data of a thin plate structure with a rib stiffener even when the rib is attached to any location where mode shapes are not measured. The proposed procedure is based on the structural dynamics modification (SDM) method and the mode shape expansion method is incorporated to estimate the mode shape data at the unmeasured points. In the expansion process, a submodel for the area where the ribs will be attached is used instead of the whole structure model. Numerical results from a plate structure with the two L-shaped ribs show that the proposed procedure produces the accurate predictions of the modal data using the estimated mode shape data at the unmeasured points. In addition, the mode shape data is estimated accurately from the submodel with free boundary condition. Furthermore, the proper number of analysical modes to be combined in the expansion process can be determined from the condition number of the modal matrix of the submodel.
一般社団法人日本機械学会の論文
2005-10-25